br = new BufferedReader(new InputStreamReader(new FileInputStream("/sdcard/test.txt")));
                        while((line = br.readLine()) != null)
                        {
                            int index = line.indexOf(":");
                            String strFieldName = line.substring(0,index);
                            String strFieldValue = line.substring(index+1);
                            
                            if(strFieldName.compareTo("Textfeld1") == 0){
                                EditText input = (EditText) findViewById(R.id.Textfeld1);
                                input.setText(strFieldValue);
                            }
                        }

        if (layout.findViewById(R.id.mandant_dialog_editMandantID) instanceof EditText) {
            System.out.println("Yes it's a EditText");
        }

        if (layout.findViewById(R.id.mandant_dialog_chkEBZ) instanceof EditText) {
            System.out.println("Yes it's a EditText");
        }
        else {
            System.out.println("Not an EditText");
        }
        
        if (layout.findViewById(R.id.mandant_dialog_chkEBZ) instanceof CheckBox) {
            System.out.println("Yes it's a CheckBox");
        }